A049921 - cp's OEIS frontend

A049921 a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 3, and a(3) = 2.

n	a(n)
1	1
2	3
3	2
4	3
5	8
6	14
7	29
8	57
9	116
10	176
11	380
12	775
13	1556
14	3117
15	6235
16	12469
17	24940
18	37412
19	81058
20	165234
21	332029
22	664839
23	1330073
24	2660350
25	5320760
26	10641579
27	21283186
28	42566387
29	85132780
30	170265565
31	340531131
32	681062261
33	1362124524

[1, 3, 2, 3, 8, 14, 29, 57, 116, 176, 380, 775, 1556, 3117, 6235, 12469, 24940, 37412, 81058, 165234, 332029, 664839, 1330073, 2660350, 5320760, 10641579, 21283186, 42566387, 85132780, 170265565, 340531131, 681062261, 1362124524]

cp's OEIS Frontend

A049921 a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 3, and a(3) = 2.

Table of values

List of values